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A high-power continuous-wave (CW) laser-diode (LD) pumped acousto-optic Q-switched Nd:YVO4 laser is presented. A short pulse at 1064 nm is obtained. With a repetition rate of 50 kHz, a maximum average output power of 5.72 W is achieved. The optical-conversion efficiency and the slope efficiency are 28% and 32.4%, respectively. At the repetition rate of 10 kHz and the pulse width of 16.3 ns, the maximum single-pulse energy of 286 μJ and the peak power of 13 kW are acquired. The laser can be used as a signal source for free-space optical communication. The output signal agrees well with the modulate signal. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 281–283, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20278

Theory and experimental results on the self-starting passive mode-locked Yb fiber ring laser generating short pulse are reported. The relations between the laser cavity parameters and mode-locked pulse characters are discussed. 980 nm LD pumped laser is used as the pump source and high concentration Yb 3+ -doped fiber is adopted as gain medium. Using the nonlinear polarization rotation (NPR) effect of the fiber, self-starting stable mode-locked pulse is obtained, with center wavelength of 1046nm, 3 dB bandwidth of 6.01 nm and 20 dB bandwidth of 16 nm. The mode-locked threshold power is 150 mW and output power is 26 mW with 50 MHz repetition rate.

In this paper, a highly-doped Yb/sup 3+/ fiber ring laser with short cavity has been presented. Comparing with normal Yb/sup 3+/ doped fiber, the relationships between the important characteristics of the Yb/sup 3+/ doped fiber laser such as threshold power, output power and laser parameters such as pump power, fiber length, couple ratio are analyzed. Numerical results are coincident with the experiment phenomenon.

A split step finite difference (SSFD) algorithm based on the Crank-Nicholson implicit scheme for high-energy pulse propagation in long-distance optical fibers is presented. The big difference from the conventional finite difference (FD) is that SSFDs do not directly discretize the second nonlinear effects terms of the nonlinear Schrodinger equation (NLSE). The numerical results illustrate that the SSFD is a robust and fast algorithm.

Theoretical and experimental results on the self-starting passive mode-locked Yb fiber-ring laser generating short pulse are reported. The relations between the laser-cavity parameters and mode-locked pulse characteristics are discussed. 980-nm LD-pumped laser is used as the pump source and high-concentration Yb 3 + -doped fiber is adopted as the gain medium. Using the nonlinear polarization rotation (NPR) effect of the fiber, a self-starting stable mode-locked pulse is obtained, with a center wavelength of 1046 nm, a 3-dB bandwidth of 6.01 nm, and a 20-dB bandwidth of 16 nm. The mode-locked threshold power is 150 mW and output power is 26 mW with a 20-MHz repetition rate.

Theory of the self-starting passive mode-locked Yb3+-doped fiber ring laser generating short pulses is presented. The ultrashort pulse Yb3+-doped fiber ring laser with all-fiber structure has been designed and turned out. Two 976nm LD pumped lasers are used as the pump sources and high concentration Yb3+-doped fiber is adopted as gain medium. Using the nonlinear polarization rotation (NPR) effect of the fiber, self-starting stable mode-locked pulse is obtained. The mode-locked threshold power of the laser is 260mW and the output power is 25mW. The center wavelength of the mode-locked pulse is 1056nm with 3dB bandwidth of 11.7nm at repetition rate of 20MHz. Comparing with the other structures of the fiber lasers, the structure we adopted is more efficient and has better stability.